The problem with one reputation based currency is that it will force opinions to be only of the “majority approved”, with dissent - real or imagined - being punished hard and fast. Non-approved opinions would then have to be discussed in secret, in hushed whispers and dim light.
And then there would be guilt by association pushed, so if a friend says something “wrong” you would have to choose between losing “wealth” or cutting the contact. This would further enforce the social compliance, by threat of effective banishment/excommunication.
